High voltage generating device

ABSTRACT

A high voltage generating device used to obtain a high voltage supplied to the television receiver picture tube anode, comprising a high voltage coil generating an a-c voltage and having an output terminal connected to one end of a rectifier means whose other end is connected to a high voltage lead line, wherein the high voltage coil and rectifier are molded together with a resin. Thus, it can be readily manufactured and will be small in size, light in weight and excellent in insulation character.

X14 amtsmas 1 United sews a e 3745438 Saeki v I 45] July 10, 1973 [541HIGH VOLTAGE GENERATING DEVICE 2,823,341 2/1953 Procter 321/15 I3,349,310 10/1967 Ladoniczki....'. 321/8 RX [75] lnventor: Tanchl Saelu,Katano, Japan 571, 50 3/1971 Hofmeister et a1. 321/8 R Assigncez"Electric Indust R Ltd., Osaka, Japan [22] Filed: July 18,1972 [211App]. No.: 272,949

Primary Examiner-William M. Shoop, Jr. Attorney-Richard K. Stevens,Robert J. Frank c1 :11.

[57] ABSTRACT [30] Foreign Application Priority Data A high voltagegeneratmg dev1ce used to obtain a h1gh I July 22, 1971 Japan 46/65231voltage pp to the television receiver picture tube 52 11.5. C1. 321/8 Rl78/DIG. 11 wmpfising a high "wage generating [5 Int CL n l 02m 7/00voltage and having an output terminal connected to [58] new H 7 5 oneend of a recttfier means whose other end is conk nected to a highvoltage lead line, wherem the high voltage coil and rectifier are moldedtogether with a [56]- References Cited resirlll. :ThL lS, itrcaln he readlily mgnufaclturecl and {illbe sma in size, 1g t 1n weig tan exce ent1n 1nsu anon UNITED STATES PATENTS character. 2,985,812 5/1961 Peterson321/15 3,225,258 12/1965 Brekoo et a1. 321/15 10 Claims, 13 DrawingFigures PAIENIwJuuomn susznnrs FIG L la PAIENIH] M 6mm 1 saw 2 OF 5 5FIG.

PAIENIEOJUL'W'W 3.745.438

SHEET 3 BF 5 FIG. 2a

I PAIENVIEU JUL I own Sum u or 5 FIG. 3b

"FIVG. 3d 603 1 I 1 HIGH VOLTAGE GENERATING DEVICE This inventionrelates to high voltage generating devices used to obtain d-c highvoltage supplied to the anode of television receiver picture tubes.

-In the usual d-c high voltage generating means, an a-c voltage is firstgenerated and stepped up through a transformer, and the a-c high voltagegenerated in the high voltage coil of the transformer is rectifiedthrough a rectifying means to thereby obtain a d-c high voltage.

For example, in the television receiver a d-c high voltage of about IDto 30 KV is supplied to the anode of the picture tube. This voltage isobtained from flyback pulses generated from the horizontal deflectioncircuit by stepping up these pulses through the flyback transformer andrectifying the transformer output through a rectifying means. However,such high voltage generating means should use special parts for thestepping-up means and rectifying means because extremely high voltage isinvolved. Also, the insulation factor is very significant. Therefore,considerably large space is inevitably occupied.

In order to solve the above problems, it has been proposed to usesolid-state rectifiers such as silicon rectifiers which are small insize but nevertheless have excellent breakdown voltage characteristicand excellent reliability. Also, in television receivers it has beenproposed to have the high voltage resonate at harmonic frequency toobtain improved operational efficiency. In case of using solid rectifiermeans, however, it is necessary to ensure a considerably large spacesurrounding the rectifier, so that support means of a considerably largesize is required to hold the rectifier sufficiently spaced from otherparts. It has further been proposed to construct a multi-stagerectification block by combining a plurality of rectifying elements anda plurality of capacitors. In this case, the entire block isaccommodated in a casing, and resin is charged into the casing toproduce a molding which is subsequently attached to a chassis frame andconnected to the high voltage coil. Again in this case, a considerablylarge space is necessary due to the plurality of capacitors.

An object of the invention is to provide a high voltage generatingdevice, which can overcome the aforementioned drawbacks inherent in theprior-art high voltage generating device, and which is small in size,excellent in insulation character and capable of being readilymanufactured. 1

For the invention to be more fully understood, it will now be describedin conjunction with some embodiments of the high voltage generatingdevice with reference to the accompanying drawings, in which:

FIGS. 10 to 10 show an embodiment of the high voltage generatingdevice'according to the invention, in elcvational view in FIG. 1a, insectional view in FIG. 1b and in fragmentary sectional view to anenlarged scale in FIG. 10;

FIG. Id is a view similar to FIG. 1b but showing a modification of thefirst embodiment;

FIGS. 2a to 20 show another embodiment of the high voltage generatingdevice according to'the invention, in sectional view in FIG. 2a, infragmentary perspective view showing part of the same under manufactureand in fragmentary sectional view to an enlarged scale showing partofthe same under manufacture in FIG. 2c;

FIGS. 3a to 3d show a further embodiment of the high voltage generatingdevice according to the inven- 5 FIGS. 4a and 4b show a still furtherembodiment of the highvoltage generating device according to theinvention, in front view in FIG. 4a and in side view in FIG. 4b.

Referring now to FIGS. 1a to Is, there is shown a high voltagegenerating device for television receivers I embodying the invention. Inthe Figures, refrence numeral 100 designates a flyback transformer forstepping up flyback pulses, numeral 200 a rectifying means, a typicalsilicon rectifier, for rectifying the a-c high voltage output of theflyback transformer 100 into a d-c high voltage, numeral 300 a highvoltage lead line for leading the d-c high voltage appearing at anoutput terminal of the rectifying means 200 to the anode electrode ofthe picture tube, and numeral 400 an insulating resin molding rigidlysurrounding and insulating the high voltage coil 103 of the flybacktransformer 100 and the rectifying means 200. The flyback transformer100 includes a ferrite core' 101 consisting of two sections assembledtogether into a frame-like form, a primary coil 102 wound on one leg 101of the ferrite core 101 and connected to an output terminal of atelevision receiver horizontal deflection circuit, and the high voltagecoil 103 wound on the outer periphery of the primary coil 102. The highvoltage coil 103 has its inner end connected to the outer end of theprimary coil 102 and its outer end provided with an end terminal 104.-The rectifying means 200 has its one end connected to the end terminal104 of the high voltage coil 103 and its other end connected to the highvoltage lead line 300. In manufacture the high voltage coil I03 andrectifying means 200 connected in the above manner are held in positionwithin a mold, and then the resin 400 in the fused stage is charged intothe mold and soliditied into a molding. In the above manner, the highvoltage coil 103 and rectifying means 200 are rigidly integrated andpermanently held in fixed relative positions with the surrounding resin400. The high voltage generating device completed in the above menner isvery compact and light in weight, and it does not include any 4 mountingmeans for its attachment to a chassis frame.

The rectifying means 200 may consist of a stack of many rectifyingelements 201 serially connected as .shownin FIG. 1c. Since theseelements are buried in the rigid insulating resin molding 202, it ispossible to meet the high breakdown voltage requirement. Alternatively,many rectifiers 203 may be connected in se-.

ries as shown in FIG. Id.

In operation, as flyback pulses are supplied to or generated by theprimary coil 102, they are stepped up to generate an a-c high voltage of10 to 30 KV p-p at the end terminal 104 of the high voltage coil 103.The a-c voltage thus generated is rectifyed through the rectifying means200 or 203 to obtain a do high voltage of 10 to 30 KV on the highvoltage lead line 300.

As has been described, with the above high voltage generating device ofFIGS. la to 1d where the high voltage coil I03 and rectifying means 200or 203 are rigidly integrated with the surrounding insulating resinmolding 400, there is no need of separately supporting the high voltagecoil 103 and rectifying means 200 or 203 and connecting them with a longlead wire, thus dispensing with the separate support or mount meansweight. Also, since the end terminal 104 provided to the high voltagecoil 103 and connecting lead leading therefrom through the rectifyingmeans 200 or 203 are hurried in the resin 400 and shielded from theoutside, dust and moisture will never accumulated on them, so that thedeterioration of the insulation character can be perfectly prevented.Further, by using incombustible resin such as epoxy resin for the resinmolding 400, it is possible to obtain a high voltage generating devicehaving excellent heat-resisting character.

FIGS. 2a, 2b and 2c show another embodiment of the high voltagegenerating device. In this embodiment, a holder 500, a bushing 600 and acap 700' are provided for the purpose of facilitating the holding ofrectifying means 203 in a mold during manufacture and for ensuring firmand safe attachment of high voltage lead line 300. In case of theembodiment of FIGS. 1a to la, in charging the fused resin in the mold itis necessary to hold the rectifying means 200 or 203 and high voltagelead line 300 in their respective fixed positions such that they willnot be readily moved by suitable support means or with strong lead wireincapable of ready bending for connecting the rectifying means 200 oring of the rectifying means 203. Also, if the high voltage lead line 200is directly supported by the hardened resin 400, it is likely to bedamaged at its supported portion in such instances as when it isconnected to or removed from the associated circuit. Therefore, it isdesirable to provide a buffer means at this support portion.

As is most clearly shown in FIG. 2b, the holder 500 which is provided tothe above ends includes a hat portion 501 covering the top of the highvoltage coil 103 and formed with a central hole or aperture 502 foreffecting the connection of the end terminal 104 of the high voltagecoil 103 and the rectifying means 203. The hat portion 501 is integralwith a channel-shaped portion 503, which is formed with a slot on oneside for inserting the rectifying means 203 and terminates at the endremote from the hat portion 501 in a bushing support portion 504 formedwith an aperture. Fitted to the bushing support portion 504 is thebushing 600, which is made of rubber and has a peripheral annular groove601 and a central hole or aperture 602.v

In the manufacture of the high voltage generating device of thisembodiment, the rectifying means 203 is inserted into the channel-shapedportion 503 through the side slot thereof, and its one end is connectedto the end terminal 104 of the high voltage coil 103, as shown in FIG.2a. The high voltage lead line 300 is supported by inserting its endportion through the aperture 602 in the bushing 600, subsequentlytwisting together its lead wire and the counterpart lead wire 204 of therectifying means 203 and fitting the metal cap 700 on the inserted endof the high voltage lead line 300, and finally caulking a portion 701 ofthe cap to drive it into the material of the high voltage lead line 300,as is clearly shown in FIG. 2c. Thereafter, the high voltage coil I03,rectifying means 203, holder 500, bushing 600 and cap 700 are integrallycovered with the resin 400.

As is shown, with the above holder 500 the rectifying means 203 can bereadily held in position to facilitate the manufacture. Also, since thehigh voltage lead line 300 is supported by the resin molding 400 via thebushing 600, its supported portion will not be damaged in such instancesas when it is bent or otherwise treated. Further, since the high voltagelead line 300 is anchored with part of the cap 700 driven into it, itwill not slip off the bushing 600 but will remain firmly and safelysupported even if external pulling force is supplied to it.

FIGS. 3a to 3d show a further embodiment of the high voltage generatingdevice, which incorporates certain improvements over the previousembodiments FIGS. 20 to 20. A first improvement lies in the hat portion501 of the holder 500 attached to the high voltage coil 103. Moreparticularly, the hat portion 501 is provided on opposite sides withdownwardly extending leg portions 505, which are further provided attheir end with respective inward protuberances 506. Thus, the holder 500may be attached to the high voltage coil 103 such that the coil 103 isclamped between the two leg portions 505 of the holder, with theprotuberances 506 squeezed between adjacent insulation layers 106insulating the conducting wire 105 of the coil 103. The leg portions 505of the holder 500 may have any desired shape so long as they face eachother such that the high voltage coil 103 can be clamped between them.With the inward protuberances 506 provided to the facing leg portions,the holder may be more firmly and stably fixed in position. This effectmay further be enhanced by forming the protuberance 506 as an arcularridge similar to the arc defined by the insulation layers 106 so thatits entire length may be wedged in between the adjacent insulationlayers. In this way, the holder 500 may be readily and stably fitted onthe high voltage coil 103 at the exact position for the temporaryattachment. Besides, by so doing the molding work for molding the resin400 may be efficiently done. Thus, it is possible to obtain a highvoltage generating device of excellent performance with the holder 500located at correct position.

A second improvement is incorporated where the rectifying means 205 andhigh voltage lead line 300 are connected together. More particularly,the rectifying means 205 is provided at one end with a connector 206,while the cap 700 is provided atits end remote from the high voltagelead line 300 with a plurality .of radially spaced resilient metaltongues 702. The cap 700 is caulked to the high voltage lead line 300,and the tongues 702 are fitted on the connector 206 of the rectifyingmeans 205. With this construction, the connection of high voltage leadline 300 and rectifying means 205 may be done very easily. Furthermore,in this emhigh voltage lead wire 300, that is, an elongate moldingportion 801 containing the rectifying means 200, 203 or 205 extendingtoward the opposite leg 101". The

core 101 includes a terminal plate 900 and a keep plate 901 assembledtogether with bolts 902 and nuts 903.

Also, a coil 107 for a different purpose may be mounted on the oppositeleg 101". With the above construction in which the elongate moldingportion 801 of the high voltage generating block 800 containing therectifying means 200, 203 or 205 extends toward the opposite leg 101",the required spaced may be minimized. Also, the elongate portion 801 isless likely to be damaged.

What we claim is:

1. A high voltage generating device comprising a high voltage coilgenerating an a-c voltage, a rectifying means connected at one end ofsaid high voltage coil, and a high voltage lead line connected to theother end of said rectifying means, and an outermost cover block ofmolded resin for containing therein and rigidly unit-' ing therewithsaid high voltage coil, said rectifying means and the end portion ofsaid high voltage lead line being connected to said rectifying means.

2. A high voltage generating device comprising:

a high voltage coil generating an a-c voltage; a rectifying meansconnected at one end to said high voltage coil; a high voltage lead lineconnected to the other end of said rectifying means, said high voltagecoil, said rectifying means and an end portion of said high voltage leadline all being rigidly integrated with a surrounding resin in the formof a molding; and a holder used to accommodate-and hold in position saidrectifying means and attached to said high voltage coil.

3. A high voltage generating device according to claim 2, wherein saidholder is provided with two leg portions facing each other for pinchingsaid high voltage coil. I l i 4. A high voltage generating deviceaccording to claim 3, wherein said two leg portions are provided withrespective inward protuberances adapted to be wedged in betweenadjacent'insulation layers of said high voltage coil.

S. A high voltage generating device comprising: a high voltage coilgenerating an a-c voltage; a rectifying a high voltage lead lineconnected to the other end of said rectifying means, said high voltagecoil, said rectifying means and an end portion of said high voltage leadline all being rigidly integrated with a surrounding resin in the formof a molding; and a bushing provided in a boundary zone between saidhigh voltage lead line and the sourrounding resin.

6. A high voltage generating device according to claim 5, which furtherincludes a metal cap fitted on the end portion of said high voltage leadline and engaging said bushing. I

7. A high voltage generating device according to means connected at oneend to said high voltage coil; 1

claim 6, wherein said metal cap is provided with a connector meansfitted on a counterpart connector of said rectifying means.

8. A high voltage generating device comprising a high voltage coilgenerating an a-c voltage, a holder holding a rectifying means inposition, said holder being fitted on said high voltage coil and havingan elongate channel-shaped portion terminating in a bushing supportportion, a rectifying means extending within said channel-shaped portionof said holder and having one end connected to said high voltage coil, abushing fitted to said bushing support portion of said holder, a highvoltage lead line having one end inserted through said bushing andconnected to the other end of said rectifying means, and a metal capfitted on said one end of said high voltage lead line'and engaging saidbushing, said high voltage coil, said holder, said rectifying means,said bushing and said metal cap all being rigidly integrated with asurrounding resin in the form of a molding.

' 9. A high voltage generating device comprising a high voltage coilgenerating an a-c voltage, a holder to hold a rectifying means inposittion, said holder being attached to said high voltage coil andhaving an elongate channel-shaped portion and two leg portions facingeach other for pinching said high voltage coil, a bushing fitted on anend of said holder remote from said high voltage coil, a rectifyingmeans extending within said channel-shaped portion of said holder andhaving one end connected to said high voltage coil, a high voltage leadline having one end inserted through said bushing, and a metal capfitted on said one end of said high voltage lead line and provided atthe end remote from said high voltage lead line with a connector meansfitted on a counterpart connector of said rectifying means, said highvoltage coil, said holder, said bushing, said rectifying means and saidmetal cap all being rigidly integrated with a surrounding resin in theform of a molding.

10. A high voltage generating device including a high voltage generatingblock containing a high voltage coil generating an a-c voltage, arectifying means having one end connected to said high voltage coil anda high voltage lead line having one end connected to the other end ofsaid rectifying means, said high voltage coil, said rectifying means andan end portion of said high voltage lead line all being rigidlyintegrated with a surrounding resin in the form of a molding, said highvoltage generating block being mounted on one leg of a frame-like coresuch that said high voltage lead line extends from said molding toward aleg opposing said first-mentioned leg of said core.

* i i i

1. A high voltage generating device comprising a high voltage coilgenerating an a-c voltage, a rectifying means connected at one end ofsaid high voltage coil, and A high voltage lead line connected to theother end of said rectifying means, and an outermost cover block ofmolded resin for containing therein and rigidly uniting therewith saidhigh voltage coil, said rectifying means and the end portion of saidhigh voltage lead line being connected to said rectifying means.
 2. Ahigh voltage generating device comprising: a high voltage coilgenerating an a-c voltage; a rectifying means connected at one end tosaid high voltage coil; a high voltage lead line connected to the otherend of said rectifying means, said high voltage coil, said rectifyingmeans and an end portion of said high voltage lead line all beingrigidly integrated with a surrounding resin in the form of a molding;and a holder used to accommodate and hold in position said rectifyingmeans and attached to said high voltage coil.
 3. A high voltagegenerating device according to claim 2, wherein said holder is providedwith two leg portions facing each other for pinching said high voltagecoil.
 4. A high voltage generating device according to claim 3, whereinsaid two leg portions are provided with respective inward protuberancesadapted to be wedged in between adjacent insulation layers of said highvoltage coil.
 5. A high voltage generating device comprising: a highvoltage coil generating an a-c voltage; a rectifying means connected atone end to said high voltage coil; a high voltage lead line connected tothe other end of said rectifying means, said high voltage coil, saidrectifying means and an end portion of said high voltage lead line allbeing rigidly integrated with a surrounding resin in the form of amolding; and a bushing provided in a boundary zone between said highvoltage lead line and the sourrounding resin.
 6. A high voltagegenerating device according to claim 5, which further includes a metalcap fitted on the end portion of said high voltage lead line andengaging said bushing.
 7. A high voltage generating device according toclaim 6, wherein said metal cap is provided with a connector meansfitted on a counterpart connector of said rectifying means.
 8. A highvoltage generating device comprising a high voltage coil generating ana-c voltage, a holder holding a rectifying means in position, saidholder being fitted on said high voltage coil and having an elongatechannel-shaped portion terminating in a bushing support portion, arectifying means extending within said channel-shaped portion of saidholder and having one end connected to said high voltage coil, a bushingfitted to said bushing support portion of said holder, a high voltagelead line having one end inserted through said bushing and connected tothe other end of said rectifying means, and a metal cap fitted on saidone end of said high voltage lead line and engaging said bushing, saidhigh voltage coil, said holder, said rectifying means, said bushing andsaid metal cap all being rigidly integrated with a surrounding resin inthe form of a molding.
 9. A high voltage generating device comprising ahigh voltage coil generating an a-c voltage, a holder to hold arectifying means in position, said holder being attached to said highvoltage coil and having an elongate channel-shaped portion and two legportions facing each other for pinching said high voltage coil, abushing fitted on an end of said holder remote from said high voltagecoil, a rectifying means extending within said channel-shaped portion ofsaid holder and having one end connected to said high voltage coil, ahigh voltage lead line having one end inserted through said bushing, anda metal cap fitted on said one end of said high voltage lead line andprovided at the end remote from said high voltage lead line with aconnector means fitted on a counterpart connector of said rectifyingmeans, said high voltage coil, said holder, said bushing, saidrectifying means and said metal cap all being rigidly integrated with asurrounding resin in the form of a molding.
 10. A high voltagegenerating device incluDing a high voltage generating block containing ahigh voltage coil generating an a-c voltage, a rectifying means havingone end connected to said high voltage coil and a high voltage lead linehaving one end connected to the other end of said rectifying means, saidhigh voltage coil, said rectifying means and an end portion of said highvoltage lead line all being rigidly integrated with a surrounding resinin the form of a molding, said high voltage generating block beingmounted on one leg of a frame-like core such that said high voltage leadline extends from said molding toward a leg opposing saidfirst-mentioned leg of said core.